Historically, humans from one group have succeeded in infiltrating humans of other groups,and all without superior intelligence or technology beyond what we all know about (or could if we read the internet).
I think what we already know is that if there are aliens, they are either relatively smart with relatively good tech, or they are biologically similar enough to us to pass the relative cursory inspections that most of us give most of the rest of us while going about our normal lives. Or both.
Historically, humans from one group have succeeded in infiltrating humans of other groups,and all without superior intelligence or technology beyond what we all know about (or could if we read the internet).
I think what we already know is that if there are aliens, they are either relatively smart with relatively good tech, or they are biologically similar enough to us to pass the relative cursory inspections that most of us give most of the rest of us while going about our normal lives. Or both.